Comment 1 for bug 732091

Figured out what's going on... it's a smspillaz's question.
So, you know unity is removing the titlebar on maximize, but after restoring the titlebar is added "after" the configure-event, so event->x and event->y of the configure event connected to the scrollbar lack of the pixels of the titlebar (and the scrollbars are higher of the amount of pixels of the titlebar)